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A haemal arch, also known as a chevron, is a bony arch on the ventral side of a tail vertebra of a vertebrate. The canal formed by the space between the arch and the vertebral body is the haemal canal. A spinous ventral process emerging from the haemal arch is referred to as the haemal spine. Blood vessels to and from the tail run through the arch.
A chevron (also spelled cheveron, especially in older documents) is a V-shaped mark or symbol, often inverted. The word is usually used in reference to a kind of fret in architecture , or to a badge or insignia used in military or police uniforms to indicate rank or length of service, or in heraldry and the designs of flags (see flag terminology ).
Activity-regulated cytoskeleton-associated protein is a plasticity protein that in humans is encoded by the ARC gene. The gene is believed to derive from a retrotransposon . [ 5 ] The protein is found in the neurons of tetrapods and other animals where it can form virus-like capsids that transport RNA between neurons.
The nerve of the arch itself runs along the cranial side of the arch and is called post-trematic nerve of the arch. Each arch also receives a branch from the nerve of the succeeding arch called the pre-trematic nerve which runs along the caudal border of the arch. In human embryo, a double innervation is seen only in the first pharyngeal arch.
The chevron system would carry on from the 1847 system with sergeants major wearing three chevrons and three arcs, quartermaster sergeants three chevrons and three ties, first sergeants threes chevrons and a lozenge, sergeants three chevrons and corporals two chevrons, with the addition of ordnance sergeants wearing three chevrons and a star.
Chevron of Edmontosaurus in front view. chevron Chevrons, or haemal arches, are bones attached to the underside of caudal vertebrae, forming the ventral surface of the tail. A chevron comprises a left and right part, which are typically fused to each other in a V-shaped fashion, enclosing a large opening that can be seen in front or back view.
In anatomy, the zygomatic arch, or cheek bone, is a part of the skull formed by the zygomatic process of the temporal bone (a bone extending forward from the side of the skull, over the opening of the ear) and the temporal process of the zygomatic bone (the side of the cheekbone), the two being united by an oblique suture (the zygomaticotemporal suture); [1] the tendon of the temporal muscle ...
First arc running along the proximal convexity of the scaphoid, lunate and triquetrum: Second arc running along the distal concavities of the scaphoid, lunate and triquetrum: Third arc running along the proximal curvatures of the capitate and hamate
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